Robot stand



FIG. 1 is a perspective view of a robot stand incorporating the subject design;

FIG. 2 is a front view of the robot stand;

FIG. 3 is a right-side view;

FIG. 4 is a rear view;

FIG. 5 is a left-side view; and,

FIG. 6 is a top view.

The broken lines in the drawings depict portions of the robot stand which form no part of the claimed design. 

CLAIM The ornamental design for a robot stand, as shown and described. 